<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
#li1{
  color: green;
}
.l{
  color: blue;
}
h1,h2{
  background-color: yellow;
}
input[type="submit"]{ background-color: red}
input[type="button"]{
  color: pink;}
*{
  border: 1px solid red;
}

  </style>
</head>
<body>
<ul>
  <li id="li1">张学友</li>
  <li class="l">刘德华</li>
  <li>郭富城</li>
</ul>
<h1 class="l">悟空</h1>
<h1>八戒</h1>
<h1>唐僧</h1>
<h2>刘备</h2>
<input type="submit">
<input type="button" value="按钮">
</body>
</html>